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- W2517047029 abstract "PURPOSE: The purpose of the present study was to examine the neuromuscular responses during intermittent isometric muscle actions at constant and varied intensities. METHODS: Eleven men and 5 women (mean ± SD, age 22.0 ± 2.6 yr) visited the lab on 2 separate days. A maximal voluntary isometric contraction (MVIC) was performed before (pretest) and after (posttest) each of the randomly ordered protocols. The 2 protocols consisted of 50, 6-s isometric muscle actions of the leg extensors followed by 2-s of rest at 60% MVIC or an alternating 40 then 80% MVIC. Each protocol averaged 60% MVIC force after the 50 intermittent isometric muscle actions during the 60% MVIC (totaling 50 repetitions at 60% MVIC) and 40/80% MVIC protocols (totaling 25 repetitions at 40% MVIC and 25 repetitions at 80% MVIC). Electromyographic (EMG) amplitude (RMS), EMG frequency (MPF), mechanomyographic (MMG) RMS, and MMG MPF were recorded from the vastus lateralis during the pretest and posttest MVICs. Separate 2 x 2 (time x protocol) repeated measures ANOVAs were used to analyze the MVIC torque, EMG RMS, EMG MPF, MMG RMS, and MMG MPF values. RESULTS: There were no significant (p > 0.05) interactions, but there were significant main effects (p < 0.05) for time (collapsed across protocol) for torque, EMG RMS, EMG MPF, and MMG MPF, but not MMG RMS (Table 1). CONCLUSION: The neuromuscular responses were typical of fatiguing, intermittent isometric muscle action, but there were no differences in the torque or neuromuscular responses from the 60% and 40/80% MVIC protocols. Thus, these findings indicated that the intensity that torque was applied had no effect on fatigue-related neuromuscular responses or motor unit activation strategies during intermittent isometric muscle actions." @default.
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- W2517047029 date "2016-05-01" @default.
- W2517047029 modified "2023-10-18" @default.
- W2517047029 title "Effects of Varied Intensity on Torque and Neuromuscular Parameters during Intermittent Isometric Muscle Actions" @default.
- W2517047029 doi "https://doi.org/10.1249/01.mss.0000485338.30393.dc" @default.
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